东南沿海防护林木麻黄种群生命表及生存分析

为给东南沿海防护林的保护和建设提供理论依据,通过样地调查和数据统计,分析东南沿海防护林木麻黄种群的径级结构,并以种群生命表和生存分析理论为基础编制东南沿海防护林木麻黄种群特定时间生命表,绘制死亡密度函数曲线、危险率函数曲线及生存曲线,并应用谱分析方法研究种群动态趋势。结果表明,东南沿海木麻黄种群有2个死亡高峰,前期的死亡率极高,至后期相对平稳,第IV龄级为种群存活曲线的分水岭,存活曲线更趋于Deevey-II型。此外,在木麻黄种群自然更新过程中基波不明显,但在幼苗生长过程中存在明显的瓶颈效应。

Life Table and Survival Analysis of Casuarina equisetifolia L. Population of Southeast Coastal Protection Forests

The diameter-class structure of Casuarina equisetifolia southeast coastal protection forest population was analyzed by plot investigation and data statistics.In addition,the population specific life tablew as compiled,the mortality curve,risk curve and survival curve were drawn,and the population dynamics were analyzed by the spectral analysis method.It is found that the population has 2 mortality peaks.The mortalityr ate was the highest in the earlier stage while stable in the later stage.The IV age-class was the watershed of population survival curve.The survival curve trended to the type of Deevey-II.Moreover,the fundamental wave was not obvious during natural regeneration progress of the population but there was an evident bottleneck effect during the growth process of seedlings.